Apparatus for dressing the ores containing gold and silver.



G. GIESEGKE.

APPARATUS FOR DRESSING THE ORES CONTAINING GOLD AND SILVER. HAPPLIOATION FILED HAY 12,1910.

1,003,595. I Patented Sept. 19,1911.

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v 0. GIESEGKB. APPARATUS FOR DRESSING THE ORES CONTAINING G-O APPLICATION FILED MAY 12,1910.

Ln AND SILVER. L@@3,595$

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Patented Sept. 19,1911.

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CARL GIESEGKE, 0E BRUNSWICK, GERMANY.

APPARATUS FOR DRESSING CONTAINING GOLD AND SILVER.

Specification of Letters Patent. Application filed May 12. 1910.

Patented Sept. 1th 1911. Serial No. 560,880.

vide an improved apparatus for dressing ores, particularly those containing gold and silver, according to the process forming the subject-matter of my copending application filed May 12,1910, Serial No.560,880.

One illustrative embodiment of my invention is represented, by Way of example in the accompanying drawing, wherein,

Figure 1 shows-my apparatus in vertical section, Fig. 2 the same in end elevation, and Fig. 3 the same in plan; Fig. 4 is a section on the, line in Fig. 1, and Fig. 5 is a perspective view of the mixing device.

Referring to the drawing, the ore, which has been preliminarily worked up to pieces about mm. in diameter in Well-known manner on large stone breakers and similar machines, passes from the feed hopper 1 onto a rotating plate Qwhich supplies it in uniform quantities to the inlet pipe 3 of the mill. This mill comprises three principal parts, namely, the two drum or tubularinill chambers 4 and 7 and a mixing apparatns 10.

i In tl chamber 4, Which works with steel. balls, the ore is preliminarily (llSll'llOgItllGtl to a degree 01" fineness which,approximately corresponds'to fine sand. The. chambers 4- and 7 are separated from one another by a double wall 5, 6. The purpose of this double Wall is to convey under specially favorable conditions the preliminarily disintegrated ore into the lsecond grinding chamber 7 which likewisd has steel balls. The Wall I has its overflow orifices more at its outer iiO periphery, While in the Wall (3 only one or more orifices are provided in the center thereof. The inaterial'will thus issue from chambers through the outer portion of wall 5 but pass from the center of wall 6 into chamber 7. The chamber a has a. larger diameter' than the chamber '4' which latter,

however, is considerably longer than. the former. New in this chamber 7 the entire quantity of ore containing precious metal is ground to a high degree, of fineness.

In order to obtain the desired degree of line ness with relatively little power and in the shortest time, an admixture of water with the ore before the commencement of thegrinding operation until its completion admissible only in. the ratio of about 33},% as indicated above. Consequently, in the chamber '7 a thick slime of the very finest particles is produced containing approximately 33,171 of water, which, in this condition would not be adapted to be conveyed, without special mechanical auxiliary means, into the lixiviation plant, or, lastly, onto amalgamating tables, because, in eonse-' quence of its small percentage of water, it is lacking in the essential capability of flowing readily. Now in order that thistinely ground ore may nevertheless possess this capability before it leaves the mill, it is subjected to another special treatment in the apparatus 10 which is connected to the chamber 7. This apparatus 10 preferably has a larger diameter than the chamber 7 and preferably comprises a cylindrical drum whose central orifice is limited by a collar-like portioi'rl3; this apparatus is scparated from the chamber 7 by a perforated wall 8, whose orifices 9 (Figs. 1, 4 and 5) with the aid of a tunnel-shaped portion 11 form the limited connection between charm her 7 and drum '10. A. water pipe 12-, whose outlet may be formed, if desired, as a sprinkler, opens into the drum 10 and continuously supplies about'lOlPSOO)? water to the thick slime which issues from the oritices Qand is distributed by the part onto the periphery of the drum. As the drum l0 rotates with the mill during this operation and theslimc is held in the drunnthe same is mixed intimately with water and converted into a thin pulp. This pulp then flows through the part 13 into the channel 14: which conducts it to the lixivia tion plant.

. For increasing the mixing action in the drum 10 ribs 16 or the like are arranged at certain intervals on the inner periphery of the drum Fig. 4). Other auxiliary means, however, may be arranged for obtaining a mixing action.

I claim 1- 1. in apparatus for drcssinp; the ores containing gold and silver. with a rotating ball grrindingulrtnn oi large diameter, of a second rotating hall grindingdrum of smaller diameter, said two drums being disposed in end to end relation, means the combinatitm,

it 'l. O

for the passage of material from said-firstnamcd drum into said second-named drum m such a manner that the material is d1s charged into the center only of the second named drum, a rotating mixing device connected-with'thc discharge end of the. second drum, and means for supplying water to said mixing device. I I r 2. In apparatus for dressing the ores containing 7 gold and sil ver; the ;combination, of

a mill complis'ing a rotating'ball grindingdrum of large diameter, and a second 'rotating hall grinding-drum of smaller diameter, a double wallfseparating said two grin-d ng drums, means for admitting material from said first-named drum into the space-E behveen, said walls, means for discharging the material from be tween said walls into the center of said second-named drum, '5 rotatm'g mnnn device disposed against said second-name drum, means for discharging material from said second-named drum into said'mixing device, and means for supplying" water to said mixi'ng device.

3. In apparatus for dressingthe ores containing gold and silver, the combination of a mill comprisin' a rotating ball grindingdrum of largeiameter and a second rotating' ball grinding-drum of smaller'diameter,

but longer than said first-named drum, a

double wall arranged between said two drums, one of said walls. beingfprovided with a plurality of perforations andthe' other of said walls forming part of said second-nameddrum having a sin le perforation in the center thereof, so t at materialmay be discharged from said first-named drum into the center of said second-named drum, a rotating mixing dev1ce'- connected with the discharge end of the, second drum,

and means for supplying water to said mixing device. v

4. In apparatus for dressing the ores containing gold and si lver, the combination of a mill comprising a rotating ball grindingdrum of largediameter' and a second rotating ball grindmg-drum of smaller diameter taining go but longer than said first-named drum, a

double wall arran ed between said two' drums, one of sai walls being provided with a pluralit of perforations and the other of said we ls forming part of said secend-named drum having a single perforationin thecenter thereof, so that material may be discharged ,jfrom said first-named drum intothe center of said second-named drumQtheop osite and discharge end of said second-name drum being provided with perforations, a mixing device avingg its wall disposed against said discharge end of said drum, said wall being provided with perforations which register with saidfirst-named perforations, and means for supplying water to said mixingdevice.

a 5'. In ap aratus for dressing the ores conid and silver, the combination of a mill comprising a rotating ball grinding drum of large diameter and a second rotating ball grinding-drum of smaller diameter but longer than said firstmamed drum, a

double wall arranged between said two' drums, one of said walls being provided with a plurality oferforations and the other of said walls orming part of. said second-named drum having-a sin 1e perforationin the center thereof,'so.t at material ma named rum into the center of'said secondnamed' drum, the opposite and discharge and of said second-named drumbein provided with perforations, a mixing. device having its wall disposed against said. dischar een be discharged from said first of said drum, said wall being provide with Witnesses: W poaMAR HAUPT,. HENRY Hasraa. 3 

